Lesson Plans for Teaching in Grade 8 - Bai giang dien tu Lop 8
E -learning Math grade 8 Rectangle
E -learning Math grade 8 Rectangle Opposite sides are parallel and congruent Adjust the rectangle above and satisfy yourself that this is so. - The diagonals bisect each other - The diagonals are congruent - Other ways to think about rectangles - A rectangle can be thought about in other ways: A square is a special case of a rectangle where all four sides are the same length. Adjust the rectangle above to create a square. It is also a special case of a parallelogram but with extra limitation that the angles are fixed at 90°. See Parallelogram definition and adjust the parallelogram to create a rectangle.
E -learning Math grade 8 Parallelogram Parallelogram 4-sided flat shape with straight sides where opposite sides are parallel. A quadrilateral is a parallelogram if: Both pairs of opposite sides are parallel. (By definition). Or: Both pairs of opposite sides are congruent. If they are congruent, they must also be parallel. Or: One pair of opposite sides are congruent and parallel. Then, the other pair must also be parallel. Also: * opposite sides are equal in length, and * opposite angles are equal (angles "a" are the same, and angles "b" are the same) NOTE: Squares, Rectangles and Rhombuses are all Parallelograms!